The D And F Block Elements

Chemistry
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The atomic numbers of elements of second inner transition elements lie in the range of :

A
88 to 101
B
89 to 102
C
90 to 103
D
91 to 104
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The chemical similarity between boron and silicon mainly due to equal value of their:

A
electronegativity
B
nuclear charge
C
charge to (ionic radius) ratio
D
atomic volume
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Beryllium resembles Aluminium in properties. This is mainly due to:

A
equal electro negativity values of elements
B
equal atomic volumes of the elements
C
equal electron affinity
D
equal nuclear charges in their atoms
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If the IP of hydrogen in its ground state is 2.18 x J/atom, then the electron affinity of ion is :

A
J/atom
B
J/atom
C
J/atom
D
J/atom
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Elements which generally exhibit variable oxidation states and form colored ions are ___________.

A
metalloids
B
transition elements
C
non-metals
D
gases
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Most of the radio active elements are present in:

A
Lanthanoids
B
Actinoids
C
Representative elements
D
Second transition series
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The element californium belongs to a family of :

A
actinide series
B
alkali metal family
C
alkaline earth family
D
lanthanide series
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Transition metals are often paramagnetic owing to:

A
high m.p. and b.p. of transition metals
B
presence of vacant d-orbitals
C
presence of one or more unpaired d-electrons
D
their less electropositive nature as compared to the elements of groups IA and IIA
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Amphoteric behaviour is shown by the oxides of:

A
and
B
and
C
and
D
and
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